You should not have got the lite version. You need a minimum 20W panel.
I use a larger panel and can charge USB batteries to fully charged.
The bigger the panel the better.
Phones are different you can plug them in directly into the panel and get useful fast charging because they are happy with a 1A type input. BUT as the sun's brightness can fluctuate such as passing cloud, and so the voltage fluctuates, the phone can stop recharging and you have to unplug and attach the cable to the phone when the sun returns as the phone (I'm thinking iPhone is notorious) will simply not accepting a fluctuating input.